Evaporative cooling electromagnetic separator

ABSTRACT

This is an evaporative cooling electromagnetic separator. It includes a shell and an iron core installed inside the shell. A set of wire coil is winded around the iron core. Inside the shell is cooling medium, which is evaporative cooling medium or mixture of evaporative cooling medium and transformer oil. A condenser is installed on the top of the shell. On one side of the condenser is a steam gathering pipe, which joints with the shell from its top, and on the other side of the condenser is a liquid gathering pipe, which connects with the shell from its flank. The present invention will help to enhance the security, reliability and cooling capability of the electromagnetic separator, and possesses broad application perspective.

FIELD OF THE INVENTION

The present invention pertains to a device that separates solids from a pile of solid materials using magnetic force. It especially pertains to an electromagnetic iron removal device separating iron chips from solid or powder materials.

BACKGROUND OF THE INVENTION

An electromagnetic separator can separate magnetic materials from nonmagnetic materials, and is widely used in many industries, such as cement, power plant, metallurgy, mining and so on. Based on cooling styles, electromagnetic separator can be classified into oil immersing style electromagnetic separator, dry electromagnetic separator and wind cooling style electromagnetic separator. Transformer oil is usually adopted as cooling medium of the oil-immersing style electromagnetic separator. It depends on single-phase medium's convection to exchange heat. High electric strength is its virtue. When temperature exceeds oil's burning point and open fire occurs at the right time, a fire might arise. So the oil-immersing style electromagnetic separator is not suitable for applications of higher fire prevention requirements. Heat exchanging of dry electromagnetic separator depends mainly on its shell and the nonmagnetic bracer. Its price is high, and even more expensive than that of oil-immersing style electromagnetic separator. The wire coil has low current density, and effective materials could not be made full use during working. Besides that, usually having a larger volume may be another disadvantage of this kind of devices. Wind-cooling style electromagnetic separator exchanges heat using a fan. This kind of device also has a larger volume. Powder such as dust and smut might adhere to the device during working. It could not be cleaned out easily, but also affects heat exchanging. On the other hand, with the increase of electromagnetic separator capacity, the limited cooling capability of these three kinds of devices could not satisfy all requirements, so it is in great need of developing a new, secure and reliable electromagnetic separator with better cooling effect.

SUMMARY OF THE INVENTION

The present invention aims to put forward a new, secure and reliable electromagnetic separator with better cooling effect.

In order to realize the purpose, the following project is carried out: An evaporative cooling electromagnetic separator includes a shell and an iron core installed inside the shell. A wire coil is winded around the iron core. Inside the shell is cooling medium, which is evaporative cooling medium or mixture of evaporative cooling medium and transformer oil. A condenser is installed on the top of the shell. On one side of the condenser is a steam gathering pipe, which joints with the shell from its top, and on the other side of the condenser is a liquid gathering pipe, which connects with the shell from its flank.

The separator described above includes a condenser that has a shell in the shape of cylinder. Two vertical clapboards in the shell separate a steam gathering room from one side of the shell and a fluid gathering room from the other side. Several cooling pipes with heat exchange pieces are installed between the clapboards, and they connect the steam gathering room and the fluid gathering room. A fan used to cool the cooling pipes is installed out of the shell.

The separator described above includes a condenser that has another type of cylindrical shell. Inside the shell is many cooling pipes with cooling water inside installed. The inner sides of cooling pipes connect with a water tank built in the shell, and the outer sides of cooling pipes connect with a water tank fixed on the outer side of the shell. Transverse clapboard, which separates the outer water tank into a lower inflow room and a topper outflow room, is set in the outer water tank. The inflow room connects with the cooling water inflow pipe, while the outflow room connects with the cooling water outflow pipe.

The separator described above, wherein said condenser includes a pressure sensor, a decompressing electromagnetic valve, and a pressure switch installed on its shell.

The separator described above, wherein said cooling medium is mixture of evaporative cooling medium and transformer oil. The ratio of heavy of evaporative cooling medium to that of transformer oil is 1:0.1˜2. A wire coil is immersed in the cooling medium entirely.

The separator described above, wherein said cooling medium is evaporative cooling medium Fla, evaporative cooling medium 4310 or evaporative cooling medium 3000.

The separator described above, wherein said cooling medium is evaporative cooling medium. A wire coil is immersed in the cooling medium partly or entirely. If the wire coil is partly immersed in the cooling medium, the height of the wire coil immersed in the cooling medium could not be less than one third of its whole height.

The heat exchanging effect of the cooling medium used in the present invention is better than that of oil-immersing style electromagnetic separator, dry electromagnetic separator and wind-cooling style electromagnetic separator. The present invention possesses the virtue of better cooling effect, even temperature distribution, no over heat in local area. So the present invention can prevent insulating material from aging and assure the electric resistance strength of the insulating material. The separator needs less wire coil because of its higher current density, so the volume and weight of it decrease as a result.

When the present invention works, its wire coil turns hot, and causes evaporation of the cooling medium. The phrase changing of the cooling medium takes away heat from the wire coil, and cools it as a result. When it goes wrong, the electromagnetic separator will not catch fire because the cooling medium is not flammable. The present invention will help to enhance the security, reliability and cooling capability of the electromagnetic separator, and possesses broad application perspective.

BRIEF DICRIPTION OF THE DRAWINGS

FIG. 1 is a view of the whole structure of the device;

FIG. 2 is a view of the structure of the condenser, and

FIG. 3 is a view of the structure of the condenser used in another application.

DETAILED DESCRIPTION OF PREFERED EMBODIMENTS

The present invention is discussed below in greater detail based on the drawings and exemplary embodiments.

Exemplary Embodiment 1

The present invention includes a shell 1 and an iron core 2 installed inside the shell 1. A wire coil 3 is winded around the iron core, and down-leads 7 reach out of the shell 1 from its top. Inside the shell 1 is cooling medium 4, which is cooling medium Fla, evaporative cooling medium 4310 or evaporative cooling 3000. Wire coil 3 is immersed in the cooling medium entirely. A condenser 5 is installed on the top of the shell 1. On one side of the condenser 5 is a steam gathering pipe 8, which joints with the shell 1 from its top, and on the other side of the condenser 5 is a liquid gathering pipe 7, which connects with the shell 1 from its flank. The condenser 5 has a shell in the shape of cylinder. Two vertical clapboards 10 inside the shell separate a steam gathering room 11 from one side of the shell and a fluid gathering room 12 from the other side. Several cooling pipes 13 with heat exchange pieces are installed between the clapboards 10, and they connect the steam gathering room 11 and the fluid gathering room 12. A fan 14 used to cool the cooling pipes 13 is installed outside of the shell. A pressure sensor 15, a decompressing electromagnetic valve 16, and a pressure switch 17 are installed on the shell of the condenser 5.

The following are working principle and process of the present invention with wind-cooling style condenser: as illustrated in FIGS. 1 and 2, wire coil produces heat when the electromagnetic separator is working, and causes temperature rising in the cooling medium 4 in the shell 1. The cooling medium 4 transforms into gas partly after the temperature reaches a certain value, and becomes mixture of gas and liquid. The mixture runs into the steam gathering room 11 through the steam gathering pipe 8, and then flows into cooling pipes 13, which are cooled by a fan. The steam of cooling medium is condensed into fluid and flows into the fluid gathering room 12, and then returns into the shell 1 through the liquid gathering pipe 9 with a lower temperature. Thus a self cycle is formed. The cooling medium in shell 1 cycles relying completely on its gravity, so no pump is needed. The pressure sensor 15 installed on the condenser 5 can measure the pressure inside of the condenser. Based on this, it can control the decompressing electromagnetic valve 16 to adjust the evaporative temperature of the cooling medium. The pressure switch 17 senses pressure insides the condenser. If the sensed value exceeds the maximum value, the decompressing electromagnetic valve 16 will regulate the pressure to assure that the system could work securely.

Exemplary Embodiment 2

The difference between Exemplary embodiment 2 and Exemplary embodiment 1 is that the wire coil 3 is partly immersed in the cooling medium, and the height of the wire coil immersed in the cooling medium is larger than one third of its whole height. The water cooling style condenser 5 has a shell in the shape of cylinder. Inside the shell is many cooling pipes 22 with cooling water inside installed. The inner sides of cooling pipes 22 connect with a water tank 23 built in the shell, and the outer sides of cooling pipes connect with a water tank 18 fixed on the outer side of the shell. Transverse clapboard 19, which separates the outer water tank 18 into a lower inflow room and a topper outflow room, is set in the outer water tank 18. The inflow room connects with the cooling water inflow pipe 20, while the outflow room connects with the cooling water outflow pipe 21. A pressure sensor 25, a decompressing electromagnetic valve 26, and a pressure switch 27 are also installed on the shell of the condenser 5.

The following are working principle and process of the separator with water-cooling style condenser: as illustrated in FIGS. 1 and 3, the mixture of gas phase and liquid phase of the cooling medium flows into the condenser 5 through the steam gathering pipe 8, and exchanges heat with cooling water flowing in the cooling pipes 22. The mixture is condensed into liquid and its temperature decreases after exchanging heat to cooling water. And then flows back to the liquid gathering pipe 9 depending on its gravity.

Exemplary Embodiment 3

The cooling medium 4 used in this application is mixture of evaporative cooling medium and transformer oil. The ratio of heavy of evaporative cooling medium to that of transformer oil is 1:2. A wire coil is immersed in the cooling medium entirely.

The present invention has less wire coil because of its higher current density, so the volume and weight of it decrease as a result. The boiling heat exchanging coefficient of its surface might be several times or more larger than the convectional heat exchanging coefficient of single state liquid, so the separator possesses the virtue of better cooling effect. When it goes wrong, the electromagnetic separator will not catch fire because the cooling medium is not flammable. In a word, the evaporative cooling style electromagnetic separator possesses high security and considerable economy benefits. 

1. An evaporative cooling electromagnetic separator including a shell, an iron core installed inside the shell, a wire coil wound around the iron core, and cooling medium, wherein: a) said cooling medium is evaporative cooling medium or mixture of evaporative cooling medium and transformer oil; b) a condenser is installed on the top of the shell, on one side of said condenser a steam gathering pipe is provided that joints with the shell from its top, and on the other side of said condenser liquid gathering pipe is provided that connects with the shell from its flank.
 2. An evaporative cooling electromagnetic separator as stated in claim 1, wherein said condenser comprising: a) a shell in the shape of cylinder, inside of which it is separated by two vertical clapboards into a steam gathering room from one side of the shell and a fluid gathering room from the other side; b) Several cooling pipes with heat exchange pieces installed between the clapboards, said cooling pipes connecting the steam gathering room and the fluid gathering room; c) A fan used to cool the cooling pipes installed outside of the shell.
 3. An evaporative cooling electromagnetic separator as stated in claim 1, wherein said condenser comprising: a) a shell in the shape of cylinder, inside of which many cooling pipes with cooling water inside are installed; b) an inner water tank built in the shell, that connects with the inner sides of said cooling pipes; c) an outer water tank fixed on the outer side of the shell, that connects with the outer sides of said cooling pipes; d) said outer water tank separated into a lower inflow room and a topper outflow room by transverse clapboard set in said outer water tank, said inflow room connecting with the cooling water inflow pipe, while said outflow room connecting with the cooling water outflow pipe.
 4. An evaporative cooling electromagnetic separator as stated in claim 2, wherein said condenser further includes a pressure sensor, a decompressing electromagnetic valve, and a pressure switch installed on its shell.
 5. An evaporative cooling electromagnetic separator as stated in claim 1, wherein a) said cooling medium being the mixture of evaporative cooling medium and transformer oil; b) the heavy ratio of said evaporative cooling medium to that of said transformer oil being 1:0.1˜2; c) a wire coil immersed in said cooling medium entirely.
 6. An evaporative cooling electromagnetic separator as stated in claim 1, wherein said cooling medium is evaporative cooling medium Fla, evaporative cooling medium 4310 or evaporative cooling medium
 3000. 7. An evaporative cooling electromagnetic separator as stated in claim 1, wherein a) said cooling medium being evaporative cooling medium; b) a wire coil immersed in the cooling medium partly or entirely; c) the height of said wire coil immersed in said cooling medium being larger than one third of the whole height of said wire coil when it is partly immersed in said cooling medium. 